switch to LuaJIT master (#217)

Author: Tieske

.github/workflows/unix_build.yml

@@ -24,7 +24,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        luaVersion: ["5.1", "5.2", "5.3", "5.4", "5.5", "luajit-2.1.0-beta3", "luajit-openresty"]
+        luaVersion: ["5.1", "5.2", "5.3", "5.4", "5.5", "luajit", "luajit-openresty"]
 
     steps:
       - name: Checkout